Camera optical lens

ABSTRACT

The present disclosure provides a camera optical lens including, from an object side to an image side in sequence: eight lenses which are, from an object side to an image side in sequence: a first lens having a positive refractive power, a second having a positive refractive power, a third lens having a negative refractive power, a fourth lens having a refractive power, a fifth lens having a positive refractive power, a sixth lens having a positive refractive power, a seventh lens having a negative refractive power, and an eighth lens having a negative refractive power; and the camera optical lens satisfies conditions of: 0.95≤f/TTL; 2.50≤f2/f≤5.00; and −20.00≤(R15+R16)/(R15−R16)≤−3.50. The camera optical lens can achieve good optical performance while meeting the design requirements for long focal length and ultra-thinness.

TECHNICAL FIELD

The present disclosure relates to the field of optical lens, particular, to a camera optical lens suitable for handheld devices, such as smart phones and digital cameras, and imaging devices, such as monitors or PC lenses.

BACKGROUND

With the emergence of smart phones in recent years, the demand for miniature camera lens is increasing day by day, but in general the photosensitive devices of camera lens are nothing more than Charge Coupled Device (CCD) or Complementary Metal-Oxide Semiconductor Sensor (CMOS sensor), and as the progress of the semiconductor manufacturing technology makes the pixel size of the photosensitive devices become smaller, plus the current development trend of electronic products towards better functions and thinner and smaller dimensions, miniature camera lens with good imaging quality therefore have become a mainstream in the market.

In order to obtain better imaging quality, the lens that is traditionally equipped in mobile phone cameras adopts a three-piece, four-piece, or even five-piece or six-piece lens structure. However, with the development of technology and the increase of the diverse demands of users, and as the pixel area of photosensitive devices is becoming smaller and smaller and the requirement of the system on the imaging quality is improving constantly, the eight-piece lens structure gradually appears in lens designs. Although the typical eight-piece lens already has good optical performance, its optical power, lens spacing and lens shape remain unreasonable to some extents, resulting in that the lens structure, which, even though, has excellent optical performance, is not able to meet the design requirement for long focal length and ultra-thinness.

Thus, there is a need to provide a camera optical lens having excellent optical performance and meeting the design requirement for long focal length and ultra-thinness.

SUMMARY

To address the above issues, an object of the present disclosure is to provide a camera optical lens that meets a design requirement of long focal length and ultra-thinness while having excellent optical performance.

For solving the above technical problem, embodiments of the present disclosure provide a camera optical lens. The camera optical lens includes eight lenses which are, from an object side to an image side in sequence: a first lens having a positive refractive power, a second having a positive refractive power, a third lens having a negative refractive power, a fourth lens having a refractive power, a fifth lens having a positive refractive power, a sixth lens having a positive refractive power, a seventh lens having a negative refractive power, and an eighth lens having a negative refractive power; and the camera optical lens satisfies conditions of: 0.95≤f/TTL; 2.50≤f2/f≤5.00; and −20.00≤(R15+R16)/(R15−R16)≤−3.50; where TTL denotes a total optical length from an object-side surface of the first lens to an image surface of the camera optical lens along an optical axis; f denotes a focal length of the camera optical lens; f2 denotes a focal length of the second lens; R15 denotes a central curvature radius of an object-side surface of the eighth lens; and R16 denotes a central curvature radius of an image-side surface of the eighth lens.

As an improvement, the camera optical lens further satisfies a condition of: 2.00≤R11/R12≤5.50; where R11 denotes a central curvature radius of an object-side surface of the sixth lens; and R12 denotes a central curvature radius of an image-side surface of the sixth lens.

As an improvement, the camera optical lens further satisfies conditions of: 0.32≤f1/f≤0.99; −2.37≤(R1+R2)/(R1−R2)≤−0.65; and 0.05≤d1/TTL≤0.15; where f1 denotes a focal length of the first lens; R1 denotes a central curvature radius of the object-side surface of the first lens; R2 denotes a central curvature radius of an image-side surface of the first lens; and d1 denotes an on-axis thickness of the first lens.

As an improvement, the camera optical lens further satisfies conditions of: −2.42≤(R3+R4)/(R3−R4)≤5.71; and 0.01≤d3/TTL≤0.05; where R3 denotes a central curvature radius of an object-side surface of the second lens; R4 denotes a central curvature radius of an image-side surface of the second lens; and d3 denotes an on-axis thickness of the second lens.

As an improvement, the camera optical lens further satisfies conditions of: −1.95≤f3/f≤−0.50; 0.88≤(R5+R6)/(R5−R6)≤4.07; and 0.01≤d5/TTL≤0.07; where f3 denotes a focal length of the third lens; R5 denotes a central curvature radius of an object-side surface of the third lens; R6 denotes a central curvature radius of an image-side surface of the third lens; and d5 denotes an on-axis thickness of the third lens.

As an improvement, the camera optical lens further satisfies conditions of: −392.40≤f4/f≤12.67; −27.17≤(R7+R8)/(R7−R8)≤157.97; and 0.01≤d7/TTL≤0.05; where f4 denotes a focal length of the fourth lens; R7 denotes a central curvature radius of an object-side surface of the fourth lens; R8 denotes a central curvature radius of an image-side surface of the fourth lens; and d7 denotes an on-axis thickness of the fourth lens.

As an improvement, the camera optical lens further satisfies following conditions: 1.12≤f5/f≤4.06; −4.95≤(R9+R10)/(R9−R10)≤−1.26; and 0.03≤d9/TTL≤0.12; where f5 denotes a focal length of the fifth lens; R9 denotes a curvature radius of an object-side surface of the fifth lens; R10 denotes a curvature radius of an image-side surface of the fifth lens; and d9 denotes an on-axis thickness of the fifth lens.

As an improvement, the camera optical lens further satisfies a condition of: 1.47≤f6/f≤6.35; 0.75≤(R11+R12)/(R11−R12)≤4.24; and 0.03≤d11/TTL≤0.12; where f6 denotes a focal length of the sixth lens; R11 denotes a central curvature radius of an object-side surface of the sixth lens; R12 denotes a central curvature radius of an image-side surface of the sixth lens; and d11 denotes an on-axis thickness of the sixth lens.

As an improvement, the camera optical lens further satisfies a condition of: −2.32≤f7/f≤−0.52; 0.77≤(R13+R14)/(R13−R14)≤5.34; and 0.02≤d13/TTL≤0.09; where f7 denotes a focal length of the seventh lens; R13 denotes a central curvature radius of an object-side surface of the seventh lens; R14 denotes a central curvature radius of an image-side surface of the seventh lens; and d13 denotes an on-axis thickness of the seventh lens.

As an improvement, the camera optical lens further satisfies a condition of: −42.17≤f8/f≤−2.16; and 0.02≤d15/TTL≤0.06; where f8 denotes a focal length of the eighth lens; and d15 denotes an on-axis thickness of the eighth lens.

The present disclosure is advantageous in: the camera optical lens in the present disclosure has excellent optical performance and has characteristics of long focal length and ultra-thinness, and is especially applicable to mobile phone camera lens assemblies and WEB camera lenses composed by such camera elements as CCD and CMOS for high pixels.

BRIEF DESCRIPTION OF DRAWINGS

To illustrate the technical solutions according to the embodiments of the present disclosure or in the prior art more clearly, the accompanying drawings for describing the embodiments or the prior art are introduced briefly in the following. Apparently, the accompanying drawings in the following description are only some embodiments of the present disclosure, and persons of ordinary skill in the art can derive other drawings from the accompanying drawings without creative efforts.

FIG. 1 is a schematic diagram of a structure of a camera optical lens according to Embodiment 1 of the present disclosure.

FIG. 2 is a schematic diagram of a longitudinal aberration of the camera optical lens shown in FIG. 1 .

FIG. 3 is a schematic diagram of a lateral color of the camera optical lens shown in FIG. 1 .

FIG. 4 is a schematic diagram of a field curvature and a distortion of the camera optical lens shown in FIG. 1 .

FIG. 5 is a schematic diagram of a structure of a camera optical lens according to Embodiment 2 of the present disclosure.

FIG. 6 is a schematic diagram of a longitudinal aberration of the camera optical lens shown in FIG. 5 .

FIG. 7 is a schematic diagram of a lateral color of the camera optical lens shown in FIG. 5 .

FIG. 8 is a schematic diagram of a field curvature and a distortion of the camera optical lens shown in FIG. 5 .

FIG. 9 is a schematic diagram of a structure of a camera optical lens according to Embodiment 3 of the present disclosure.

FIG. 10 is a schematic diagram of a longitudinal aberration of the camera optical lens shown in FIG. 9 .

FIG. 11 is a schematic diagram of a lateral color of the camera optical lens shown in FIG. 9 .

FIG. 12 is a schematic diagram of a field curvature and a distortion of the camera optical lens shown in FIG. 9 .

DETAILED DESCRIPTION OF EMBODIMENTS

To make the objects, technical solutions, and advantages of the present disclosure clearer, embodiments of the present disclosure are described in detail with reference to accompanying drawings in the following. A person of ordinary skill in the art can understand that, in the embodiments of the present disclosure, many technical details are provided to make readers better understand the present disclosure. However, even without these technical details and any changes and modifications based on the following embodiments, technical solutions required to be protected by the present disclosure can be implemented.

Embodiment 1

Referring to the accompanying drawing, the present disclosure provides a camera optical lens 10. FIG. 1 shows a schematic diagram of a camera optical lens 10 according to Embodiment 1 of the present disclosure, and the camera optical lens 10 includes eight lenses. Specifically, an object side refers to the left side, an image side refers to the right side, and the camera optical lens 10 includes, from the object side to the image side in sequence: an aperture S1, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7 and an eighth lens L8. An optical element such as an optical filter GF can be arranged between the eighth lens L8 and an image surface Si.

In this embodiment, the first lens L1 has a positive refractive power, the second lens L2 has a positive refractive power, the third lens L3 has a negative refractive power, the fourth lens L4 has a positive refractive power, the fifth lens L5 has a positive refractive power, the sixth lens L6 has a positive refractive power, the seventh lens L7 has a negative refractive power and the eighth lens L8 has a negative refractive power.

In this embodiment, the first lens L1 has a positive refractive power, which facilitates improving performance of the camera optical lens.

In this embodiment, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 are made of plastic material. In other embodiments, the lenses may be made of other material.

In this embodiment, a total optical length from the object side surface of the first lens L1 to an image surface Si of the camera optical lens 10 along an optical axis is defined as TTL; a focal length of the camera optical lens 10 is defined as f, a focal length of the second lens L2 is defined as f2, a central curvature radius of the object-side surface of the eighth lens L8 is defined as R15, and a central curvature radius of the image-side surface of the eighth lens L8 is defined as R16. The camera optical lens 10 satisfies conditions of: 0.95≤f/TTL;   (1) 2.50≤f2/f≤5.00; and   (2) −20.00≤(R15+R16)/(R15−R16)≤−3.50.   (3)

Condition (1) specifies a ratio of the focal length of the camera optical lens 10 and the total optical length of the camera optical lens 10. Within this condition, given a same total optical length, the camera optical lens 10 has the focal length longer.

Condition (2) specifies a ratio of the focal length of the second lens L2 to the focal length of the camera optical lens 10. Within this condition, a spherical aberration and a field curvature of the camera optical lens 10 can be effectively balanced. Preferably, the camera optical lens 10 satisfies a condition of 2.65≤f2/f≤4.99.

Condition (3) specifies a shape of the eighth lens L8. Within this condition, correction of the off-axis aberration is facilitated. Preferably, the camera optical lens 10 satisfies a condition of −19.75≤(R15+R16)/(R15−R16)≤−3.53.

A central curvature radius of an object-side surface of the sixth lens L6 is defined as R11, and a central curvature radius of an image-side surface of the sixth lens L6 is defined as R12. The camera optical lens 10 satisfies a condition of 2.00≤R11/R12≤5.50, which specifies a shape of the sixth lens L6. Within this condition, the deflection degree of the light passing through the lens can be alleviated, and the aberration can be effectively reduced. Preferably, the camera optical lens 10 satisfies a condition of 2.05≤R11/R12≤5.27.

In this embodiment, the first lens L1 includes an object-side surface being convex in a paraxial region and an image-side surface being convex in the paraxial region.

A focal length of the first lens is defined as f1, and the focal length of the camera optical lens 10 is defined as f. The camera optical lens 10 satisfies a condition of 0.32≤f1/f≤0.99, which specifies a ratio of the focal length of the first lens L1 to the focal length of the camera optical lens 10. Within this condition, the first lens L1 has an appropriate positive refractive power, the correction of the aberration of the camera optical lens 10 is facilitated, and meanwhile the development of the camera optical lens 10 towards ultra-thinness is facilitated. Preferably, the camera optical lens 10 satisfies a condition of 0.52≤f1/f≤0.79.

A central curvature radius of an object-side surface of the first lens L1 is defined as R1, and a central curvature radius of an image-side surface of the first lens L1 is defined as R2. The camera optical lens 10 satisfies a condition of −2.37≤(R1+R2)/(R1−R2)≤−0.65. This can reasonably control a shape of the first lens L1 in such a manner that the first lens L1 can effectively correct a spherical aberration of the camera optical lens 10. Preferably, the camera optical lens 10 satisfies a condition of −1.48≤(R1+R2)/(R1−R2)≤−0.81.

An on-axis thickness of the first lens L1 is defined as d1, and the total optical length of the camera optical lens 10 is defined as TTL. The camera optical lens 10 satisfies a condition of 0.05≤d1/TTL≤0.15. Within this condition, ultra-thinness of the lenses is facilitated. Preferably, the camera optical lens 10 satisfies a condition of 0.08≤d1/TTL≤0.12.

In this embodiment, the second lens L2 includes an object-side surface being concave in a paraxial region and an image-side surface being convex in the paraxial region.

A central curvature radius of the object-side surface of the second lens L2 is defined as R3, and a central curvature radius of the image-side surface of the second lens L2 is defined as R4. The camera optical lens 10 satisfies a condition of −2.42≤(R3+R4)/(R3−R4)≤5.71, which specifies a shape of the second lens L2. Within this condition, with development of the camera optical lens 10 towards ultra-thinness, correction of the on-axis chromatic aberration is facilitated. Preferably, the camera optical lens 10 satisfies a condition of −1.51≤(R3+R4)/(R3−R4)≤4.57.

An on-axis thickness of the second lens L2 is defines as d3, and the total optical length of the camera optical lens 10 is defined as TTL. The camera optical lens 10 satisfies a condition of 0.01≤d3/TTL≤0.05. Within this condition, ultra-thinness of the lenses is facilitated. Preferably, the camera optical lens 10 satisfies a condition of 0.02≤d3/TTL≤0.04.

In this embodiment, the third lens L3 includes an object-side surface being convex in a paraxial region and an image-side surface being concave in the paraxial region.

A focal length of the third lens L3 is defined as f3, and the focal length of the camera optical lens 10 is defined as f. The camera optical lens 10 satisfies a condition of −1.95≤f3/f≤−0.50. With reasonable distribution of the refractive power, the camera optical lens 10 has better imaging quality and lower sensitivity. Preferably, the camera optical lens 10 satisfies a condition of −1.22≤f3/f≤−0.63.

A central curvature radius of the object-side surface of the third lens L3 is defined as R5, and a central curvature radius of the image-side surface of the third lens L3 is defined as R6. The camera optical lens 10 satisfies a condition of 0.88≤(R5+R6)/(R5−R6)≤4.07, which effectively controls a shape of the third lens L3 and facilitates shaping of the third lens L3. Within this condition, the deflection degree of the light passing through the lens can be alleviated, and the aberration can be effectively reduced. Preferably, the camera optical lens 10 satisfies a condition of 1.42≤(R5+R6)/(R5−R6)≤3.25.

An on-axis thickness of the third lens L3 is defined as d5, and the total optical length of the camera optical lens 10 is defined as TTL. The camera optical lens 10 satisfies a condition of 0.01≤d5/TTL≤0.07. Within this condition, ultra-thinness of the lenses is facilitated. Preferably, the camera optical lens 10 satisfies a condition of 0.02≤d5/TTL≤0.06.

In this embodiment, the fourth lens L4 includes an object-side surface being convex in a paraxial region and an image-side surface being concave in the paraxial region.

A focal length of the fourth lens L4 is defined as f4, and the focal length of the camera optical lens 10 is defined as f, and. The camera optical lens 10 satisfies a condition of −392.40≤f4/f≤12.67, which specifies a ratio of the focal length of the fourth lens L4 and the focal length of the camera optical lens 10. Within this condition, improvement of performance of the camera optical lens 10 is facilitated. Preferably, the camera optical lens 10 satisfies a condition of −245.25≤f4/f≤10.14.

A central curvature radius of the object-side surface of the fourth lens L4 is defined as R7, and a central curvature radius of the image-side surface of the fourth lens L4 is defined as R8. The camera optical lens 10 satisfies a condition of −27.17≤(R7+R8)/(R7−R8)≤157.97, which specifies a shape of the fourth lens L4. Within this condition, with development of the camera optical lens 10 towards ultra-thinness, correction of the off-axis aberration is facilitated. Preferably, the camera optical lens 10 satisfies a condition of −16.98≤(R7+R8)/(R7−R8)≤126.38.

An on-axis thickness of the fourth lens L4 is defined as d7, and the total optical length of the camera optical lens 10 is defined as TTL. The camera optical lens 10 satisfies a condition of 0.01≤d7/TTL≤0.05. Within this condition, ultra-thinness of the lenses is facilitated. Preferably, the camera optical lens 10 satisfies a condition of 0.02≤d7/TTL≤0.04.

In this embodiment, the fifth lens L5 includes an object-side surface being convex in a paraxial region and an image-side surface being concave in the paraxial region.

A focal length of the fifth lens L5 is defined as f5, and the focal length of the camera optical lens 10 is defined as f. The camera optical lens 10 satisfies a condition of 1.12≤f5/f≤4.06, which specifies the fifth lens L5 so as to enable the light angle of the camera optical lens 10 to be gradual and reduce the tolerance sensitivity. Preferably, the camera optical lens 10 satisfies a condition of 1.79≤f5/f≤3.25.

A central curvature radius of the object-side surface of the fifth lens L5 is defined as R9, and a central curvature radius of the image-side surface of the fifth lens L5 is defined as R10. The camera optical lens 10 satisfies a condition of −4.95≤(R9+R10)/(R9−R10)≤−1.26, which specifies a shape of the fifth lens L5. Within this condition, with development of the camera optical lens 10 towards ultra-thinness, correction of the off-axis aberration is facilitated. Preferably, the camera optical lens 10 satisfies a condition of −3.09≤(R9+R10)/(R9−R10)≤−1.58.

An on-axis thickness of the fifth lens L5 is defined as d9, and the total optical length of the camera optical lens 10 is defined as TTL. The camera optical lens 10 satisfies a condition of 0.03≤d9/TTL≤0.12. Within this condition, ultra-thinness of the lenses is facilitated. Preferably, the camera optical lens 10 satisfies a condition of 0.05≤d9/TTL≤0.09.

In this embodiment, the sixth lens L6 includes an object-side surface being concave in a paraxial region and an image-side surface being convex in the paraxial region.

A focal length of the sixth lens L6 is defined as f6, and the focal length of the camera optical lens 10 is defined as f. The camera optical lens 10 satisfies a condition of 1.47≤f6/f≤6.35. With reasonable distribution of the refractive power, the camera optical lens 10 has better imaging quality and lower sensitivity. Preferably, the camera optical lens 10 satisfies a condition of 2.36≤f6/f≤5.08.

A central curvature radius of an object-side surface of the sixth lens L6 is defined as R11, and a central curvature radius of an image-side surface of the sixth lens L6 is defined as R12. The camera optical lens 10 satisfies a condition of 0.75≤(R11+R12)/(R11−R12)≤4.24, which specifies a shape of the sixth lens L6. Within this condition, with development of the camera optical lens 10 towards ultra-thinness, correction of the off-axis aberration is facilitated. Preferably, the camera optical lens 10 satisfies a condition of 1.20≤(R11+R12)/(R11−R12)≤3.39.

An on-axis thickness of the sixth lens L6 is defined as d11, and the total optical length of the camera optical lens 10 is defined as TTL. The camera optical lens 10 satisfies a condition of 0.03≤d11/TTL≤0.12. Within this condition, ultra-thinness of the lenses is facilitated. Preferably, the camera optical lens 10 satisfies a condition of 0.05≤d11/TTL≤0.10.

In this embodiment, the seventh lens L7 includes an object-side surface being convex in a paraxial region and an image-side surface being concave in the paraxial region.

A focal length of the seventh lens L7 is defined as f7, and the focal length of the camera optical lens 10 is defined as f. The camera optical lens 10 satisfies a condition of −2.32≤f7/f≤−0.52. With reasonable distribution of the refractive power, the camera optical lens 10 has better imaging quality and lower sensitivity. Preferably, the camera optical lens 10 satisfies a condition of −1.45≤f7/f≤−0.65.

A central curvature radius of the object-side surface of the seventh lens L7 is defined as R13, and a central curvature radius of the image-side surface of the seventh lens L7 is defined as R14. The camera optical lens 10 satisfies a condition of 0.77≤(R13+R14)/(R13−R14)≤5.34, which specifies a shape of the seventh lens L7. Within this condition, with development of the camera optical lens 10 towards ultra-thinness, correction of the off-axis aberration is facilitated. Preferably, the camera optical lens 10 satisfies a condition of 1.23≤(R13+R14)/(R13−R14)≤4.27.

An on-axis thickness of the seventh lens L7 is defined as d13, and the total optical length of the camera optical lens 10 is defined as TTL. The camera optical lens 10 satisfies a condition of 0.02≤d13/TTL≤0.09. Within this condition, ultra-thinness of the lenses is facilitated. Preferably, the camera optical lens 10 satisfies a condition of 0.04≤d13/TTL≤0.07.

In this embodiment, the eighth lens L8 includes an object-side surface being concave in a paraxial region and an image-side surface being convex in the paraxial region.

A focal length of the eighth lens L8 is defined as f8, and the focal length of the camera optical lens 10 is defined as f. The camera optical lens 10 satisfies a condition of −42.17≤f8/f≤−2.16. With reasonable distribution of the refractive power, the camera optical lens 10 has better imaging quality and lower sensitivity. Preferably, the camera optical lens 10 satisfies a condition of −26.36≤f8/f≤−2.70.

An on-axis thickness of the eighth lens L8 is defined as d15, the total optical length of the camera optical lens 10 is defined as TTL. The camera optical lens 10 satisfies a condition of 0.02≤d15/TTL≤0.06. Within this condition, ultra-thinness of the lenses is facilitated. Preferably, the camera optical lens 10 satisfies a condition of 0.03≤d15/TTL≤0.05.

It should be appreciated that, in other embodiments, configuration of the object-side surfaces and the image-side surfaces of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 may have a distribution in convex and concave in the paraxial region other than that of the above-discussed embodiment.

In this embodiment, an image height of the camera optical lens 10 is defined as IH, and the focal length of the camera optical lens 10 is defined as f. The camera optical lens 10 satisfies a condition of f/IH≥2.13, which enables the camera optical lens 10 to achieve long focal length.

In this embodiment, the image height of the camera optical lens 10 is defined as IH, and the total optical length of the camera optical lens 10 is defined as TTL. The camera optical lens 10 satisfies a condition of TTL/IH≤2.41, which facilitates ultra-thinness of the lenses.

In this embodiment, the focal length of the camera optical lens 10 is defined as f, and a combined focal length of the first lens L1 and of the second lens L2 is defined as f12. The camera optical lens 10 satisfies a condition of 0.27≤f12/f≤0.88. Within this condition, the aberration and distortion of the camera optical lens 10 can be eliminated and a back focal length of the camera optical lens is reduced, thereby maintaining miniaturization of the camera optical lens. Preferably, the camera optical lens 10 satisfies a condition of 0.43≤f12/f≤0.71.

When the above relationships are satisfied, the camera optical lens 10 meets the design requirements of long focal length and ultra-thinness while having excellent optical imaging performance. Based on the characteristics of the camera optical lens 10, the camera optical lens 10 is particularly applicable to mobile camera lens assemblies and WEB camera lenses composed of such camera elements as CCD and CMOS for high pixels.

The camera optical lens 10 will be further described with reference to the following examples. Symbols used in various examples are shown as follows. The focal length, on-axis distance, central curvature radius, on-axis thickness, inflexion point position, and arrest point position are all in units of mm.

TTL: Total optical length (the distance from the object side surface of the first lens L1 to the image surface Si of the camera optical lens along the optical axis) in mm.

FNO: ratio of an effective focal length and an entrance pupil diameter of the camera optical lens.

In addition, inflexion points and/or arrest points can be arranged on the object-side surface and/or the image-side surface of the lenses, so as to satisfy the demand for high quality imaging. The description below can be referred for specific implementations.

The design data of the camera optical lens 10 in Embodiment 1 of the present disclosure are shown in Table 1 and Table 2.

TABLE 1 R d nd νd S1 ∞ d0= −0.600 R1 3.300 d1= 0.946 nd1 1.5444 ν1 55.82 R2 −223.243 d2= 0.240 R3 −21.229 d3= 0.216 nd2 1.6700 ν2 19.39 R4 −12.392 d4= 0.030 R5 10.083 d5= 0.448 nd3 1.6700 ν3 19.39 R6 3.418 d6= 1.327 R7 7.753 d7= 0.284 nd4 1.6700 ν4 19.39 R8 8.985 d8= 0.798 R9 8.896 d9= 0.646 nd5 1.5346 ν5 55.70 R10 28.762 d10= 1.118 R11 −92.460 d11= 0.625 nd6 1.5844 ν6 28.22 R12 −18.373 d12= 0.318 R13 4.079 d13= 0.448 nd7 1.5346 ν7 55.70 R14 2.290 d14= 0.638 R15 −6.821 d15= 0.400 nd8 1.5346 ν8 55.70 R16 −12.170 d16= 0.620 R17 ∞ d17= 0.210 ndg 1.5168 νg 64.17 R18 ∞ d18= 0.296

In the table, meanings of various symbols will be described as follows.

S1: aperture;

R: central curvature radius of an optical surface;

R1: central curvature radius of the object-side surface of the first lens L1;

R2: central curvature radius of the image-side surface of the first lens L1;

R3: central curvature radius of the object-side surface of the second lens L2;

R4: central curvature radius of the image-side surface of the second lens L2;

R5: central curvature radius of the object-side surface of the third lens L3;

R6: central curvature radius of the image-side surface of the third lens L3;

R7: central curvature radius of the object-side surface of the fourth lens L4;

R8: central curvature radius of the image-side surface of the fourth lens L4;

R9: central curvature radius of the object-side surface of the fifth lens L5;

R10: central curvature radius of the image-side surface of the fifth lens L5;

R11: central curvature radius of the object-side surface of the sixth lens L6;

R12: central curvature radius of the image-side surface of the sixth lens L6;

R13: central curvature radius of the object-side surface of the seventh lens L7;

R14: central curvature radius of the image-side surface of the seventh lens L7;

R15: central curvature radius of an object-side surface of the eighth lens L8;

R16: central curvature radius of an image-side surface of the eighth lens L8;

R17: central curvature radius of an object-side surface of the optical filter GF;

R18: central curvature radius of an image-side surface of the optical filter GF;

d: on-axis thickness of a lens and an on-axis distance between lenses;

d0: on-axis distance from the aperture Si to the object-side surface of the first lens L1;

d1: on-axis thickness of the first lens L1;

d2: on-axis distance from the image-side surface of the first lens L1 to the object-side surface of the second lens L2;

d3: on-axis thickness of the second lens L2;

d4: on-axis distance from the image-side surface of the second lens L2 to the object-side surface of the third lens L3;

d5: on-axis thickness of the third lens L3;

d6: on-axis distance from the image-side surface of the third lens L3 to the object-side surface of the fourth lens L4;

d7: on-axis thickness of the fourth lens L4;

d8: on-axis distance from the image-side surface of the fourth lens L4 to the object-side surface of the fifth lens L5;

d9: on-axis thickness of the fifth lens L5;

d10: on-axis distance from the image-side surface of the fifth lens L5 to the object-side surface of the sixth lens L6;

d11: on-axis thickness of the sixth lens L6;

d12: on-axis distance from the image-side surface of the sixth lens L6 to the object-side surface of the seventh lens L7;

d13: on-axis thickness of the seventh lens L7;

d14: on-axis distance from the image-side surface of the seventh lens L7 to the object-side surface of the eighth lens L8;

d15: on-axis thickness of the eighth lens L8;

d16: on-axis distance from the image-side surface of the eighth lens L8 to the object-side surface of the optical filter GF;

d17: on-axis thickness of the optical filter GF;

d18: on-axis distance from the image-side surface of the optical filter GF to the image surface Si;

nd: refractive index of the d line;

nd1: refractive index of the d line of the first lens L1;

nd2: refractive index of the d line of the second lens L2;

nd3: refractive index of the d line of the third lens L3;

nd4: refractive index of the d line of the fourth lens L4;

nd5: refractive index of the d line of the fifth lens L5;

nd6: refractive index of the d line of the sixth lens L6;

nd7: refractive index of the d line of the seventh lens L7;

nd8: refractive index of the d line of the eighth lens L8;

ndg: refractive index of the d line of the optical filter GF;

vd: abbe number;

v1: abbe number of the first lens L1;

v2: abbe number of the second lens L2;

v3: abbe number of the third lens L3;

v4: abbe number of the fourth lens L4;

v5: abbe number of the fifth lens L5;

v6: abbe number of the sixth lens L6;

v7: abbe number of the seventh lens L7;

v8: abbe number of the eighth lens L8;

vg: abbe number of the optical filter GF.

Table 2 shows aspheric surface data of the camera optical lens 10 in Embodiment 1 of the present disclosure.

TABLE 2 Conic coefficient Aspheric surface coefficients k A4 A6 A8 A10 A12 R1 −1.9203E−01  5.7496E−04 4.6516E−06 −1.7326E−06   2.3835E−06 −6.1208E−07  R2 −1.4625E+02  8.3184E−04 2.8376E−04 −1.1349E−04   2.0275E−05 −2.2439E−06  R3  8.2395E+01 −7.6861E−03 4.5700E−03 −1.6842E−03   2.5442E−04 1.8251E−05 R4 −7.7611E+01 −6.8217E−04 −1.1254E−03  3.0953E−04 −2.9897E−04 1.6045E−04 R5 −6.7887E+00  7.1919E−03 −2.7917E−03  5.8612E−04  5.3984E−06 −9.5697E−06  R6 −2.0279E+00 −8.0538E−04 5.1038E−03 −2.1081E−03   9.7854E−04 −3.1792E−04  R7  3.5509E+00 −1.6205E−02 1.7489E−03 4.4392E−05 −1.1153E−04 5.8002E−05 R8 −1.8561E+01 −1.6062E−02 1.9673E−03 2.2649E−04 −3.7925E−04 2.4277E−04 R9 −4.7335E−01 −1.3563E−02 3.9892E−04 4.5584E−04 −1.9658E−04 4.0061E−05 R10 −9.0000E+01 −1.4694E−02 −9.2971E−04  1.0246E−03 −4.3148E−04 1.0284E−04 R11 −9.8990E+01 −1.0521E−03 −1.2306E−02  5.3593E−03 −1.9838E−03 5.2802E−04 R12  3.3839E+01 −1.6980E−03 −9.6131E−03  3.7437E−03 −9.2822E−04 1.7014E−04 R13 −1.8285E+01 −6.8387E−02 8.5046E−03 −3.9316E−03   2.7672E−03 −9.8699E−04  R14 −8.1132E+00 −3.3601E−02 7.5476E−04 2.5360E−03 −1.1039E−03 2.2616E−04 R15  2.4243E+00 −2.1620E−02 2.2410E−02 −8.1084E−03   1.6152E−03 −2.1652E−04  R16  9.0268E+00 −2.4730E−02 1.4544E−02 −4.0087E−03   6.6164E−04 −7.1994E−05  Conic coefficient Aspheric surface coefficients k A14 A16 A18 A20 R1 −1.9203E−01  5.8020E−08 −2.6073E−09 5.6562E−11 −4.7842E−13  R2 −1.4625E+02  1.5505E−07 −6.4232E−09 1.4493E−10 −1.3623E−12  R3  8.2395E+01 −9.8731E−06  8.6341E−07 0.0000E+00 0.0000E+00 R4 −7.7611E+01 −3.9823E−05  4.7112E−06 −2.1760E−07  0.0000E+00 R5 −6.7887E+00 −1.1727E−06  2.6829E−07 0.0000E+00 0.0000E+00 R6 −2.0279E+00  7.3785E−05 −9.4277E−06 4.8893E−08 8.7508E−08 R7  3.5509E+00 −5.7139E−06 −2.6180E−07 0.0000E+00 0.0000E+00 R8 −1.8561E+01 −8.1423E−05  1.7882E−05 −2.2650E−06  1.1319E−07 R9 −4.7335E−01 −2.9973E−06 −5.7588E−09 0.0000E+00 0.0000E+00 R10 −9.0000E+01 −1.5896E−05  1.5679E−06 −7.8046E−08  0.0000E+00 R11 −9.8990E+01 −9.5485E−05  9.7482E−06 −3.9681E−07  0.0000E+00 R12  3.3839E+01 −2.7237E−05  3.5845E−06 −3.0296E−07  1.1601E−08 R13 −1.8285E+01  1.9503E−04 −2.2004E−05 1.3106E−06 −3.1526E−08  R14 −8.1132E+00 −2.6110E−05  1.7480E−06 −6.3502E−08  9.6944E−10 R15  2.4243E+00  2.0645E−05 −1.3143E−06 4.8462E−08 −7.6538E−10  R16  9.0268E+00  5.2266E−06 −2.4253E−07 6.4654E−09 −7.5007E−11 

In table 2, K is a conic coefficient, and A4, A6, A8, A10, A12, A14, A16, A18 and A20 are aspheric surface coefficients. y=(x ² /R)/{1+[1−(k+1)(x ² /R ²)]^(1/2) }+A4x ⁴ +A6x ⁶ +A8x ⁸ +A10x ¹⁰ +A12x ¹² +A14x ¹⁴ +A16x ¹⁶ +A18x ¹⁸ +A20x ²⁰   (4)

Herein, x denotes a vertical distance between a point in the aspheric curve and the optical axis, and y denotes an aspheric depth (i.e. a vertical distance between the point having a distance of x from the optical axis and a plane tangent to the vertex on the optical axis of the aspheric surface).

For convenience, an aspheric surface of each lens surface uses the aspheric surfaces shown in the above formula (1). However, the present disclosure is not limited to the aspherical polynomials form shown in the formula (1).

Table 3 and Table 4 show design data of inflexion points and arrest points of each lens of the camera optical lens 10 according to Embodiment 1 of the present disclosure. P1R1 and P1R2 represent the object-side surface and the image-side surface of the first lens L1, P2R1 and P2R2 represent the object-side surface and the image-side surface of the second lens L2, P3R1 and P3R2 represent the object-side surface and the image-side surface of the third lens L3, P4R1 and P4R2 represent the object-side surface and the image-side surface of the fourth lens L4, P5R1 and P5R2 represent the object-side surface and the image-side surface of the fifth lens L5, P6R1 and P6R2 represent the object-side surface and the image-side surface of the sixth lens L6, P7R1 and P7R2 represent the object-side surface and the image-side surface of the seventh lens L7, and P8R1 and P8R2 represent the object-side surface and the image-side surface of the eighth lens L8. The data in the column named “inflexion point position” refers to vertical distances from inflexion points arranged on each lens surface to the optic axis of the camera optical lens 10. The data in the column named “arrest point position” refers to vertical distances from arrest points arranged on each lens surface to the optical axis of the camera optical lens 10.

TABLE 3 Number(s) of Inflexion point Inflexion point inflexion points position 1 position 2 P1R1 0 / / P1R2 1 0.605 / P2R1 0 / / P2R2 0 / / P3R1 0 / / P3R2 0 / / P4R1 2 1.025 1.365 P4R2 2 0.775 1.535 P5R1 1 0.895 / P5R2 1 0.435 / P6R1 0 / / P6R2 1 2.545 / P7R1 1 0.485 / P7R2 2 0.735 2.955 P8R1 1 2.815 / P8R2 0 / /

TABLE 4 Number(s) of arrest points Arrest point position 1 P1R1 0 / P1R2 1 1.015 P2R1 0 / P2R2 0 / P3R1 0 / P3R2 0 / P4R1 0 / P4R2 0 / P5R1 1 1.695 P5R2 1 0.755 P6R1 0 / P6R2 0 / P7R1 1 0.865 P7R2 1 1.505 P8R1 0 / P8R2 0 /

FIG. 2 and FIG. 3 illustrate a longitudinal aberration and a lateral color of light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, 470 nm and 430 nm after passing the camera optical lens 10 in Embodiment 1, respectively. FIG. 4 illustrates a schematic diagram of a field curvature and a distortion of light with a wavelength of 555 nm after passing the camera optical lens 10 in Embodiment 1. A field curvature S in FIG. 4 is a field curvature in a sagittal direction, and T is a field curvature in a tangential direction.

In the subsequent Table 13, various parameters of Embodiments 1, 2 and 3 and values corresponding to the parameters specified in the above conditions are shown.

As shown in Table 13, Embodiment 1 satisfies the various conditions.

In this Embodiment, an entrance pupil diameter (ENPD) of the camera optical lens 10 is 4.172 mm, an image height (IH) of 1.0 H is 4.000 mm, and a field of view (FOV) in a diagonal direction is 45.52°. Thus, the camera optical lens 10 achieves long focal length and ultra-thinness, the on-axis and off-axis chromatic aberration is sufficiently corrected, thereby achieving excellent optical performance.

Embodiment 2

Embodiment 2, which provides a camera optical lens 20 structurally shown in FIG. 5 , is basically the same as Embodiment 1 and involves symbols having the same meanings as Embodiment 1, and only differences therebetween will be described in the following.

Table 5 and Table 6 show design data of a camera optical lens 20 in Embodiment 2 of the present disclosure.

TABLE 5 R d nd νd S1 ∞ d0= −0.600 R1 3.228 d1= 0.955 nd1 1.5444 ν1 55.82 R2 −922.222 d2= 0.223 R3 −22.551 d3= 0.255 nd2 1.6700 ν2 19.39 R4 −9.826 d4= 0.109 R5 11.924 d5= 0.302 nd3 1.6700 ν3 19.39 R6 3.312 d6= 1.441 R7 8.638 d7= 0.291 nd4 1.6700 ν4 19.39 R8 10.210 d8= 0.671 R9 8.987 d9= 0.658 nd5 1.5346 ν5 55.70 R10 27.145 d10= 1.089 R11 −61.959 d11= 0.684 nd6 1.5844 ν6 28.22 R12 −12.661 d12= 0.499 R13 5.959 d13= 0.436 nd7 1.5346 ν7 55.70 R14 2.601 d14= 0.531 R15 −6.292 d15= 0.357 nd8 1.5346 ν8 55.70 R16 −10.339 d16= 0.620 R17 ∞ d17= 0.210 ndg 1.5168 νg 64.17 R18 ∞ d18= 0.235

Table 6 shows aspheric surface data of each lens of the camera optical lens 20 in Embodiment 2 of the present disclosure.

TABLE 6 Conic coefficient Aspheric surface coefficients k A4 A6 A8 A10 A12 R1 −2.2040E−01  7.3664E−04 1.7329E−05 −1.4733E−06 2.7741E−06 −1.0410E−06 R2  9.0000E+01  1.0301E−03 3.0000E−04 −2.0084E−04 5.3892E−05 −8.4401E−06 R3  8.9990E+01 −3.4887E−03 2.3690E−03 −1.8462E−03 7.1816E−04 −1.5023E−04 R4 −7.7681E+01 −1.6574E−03 −1.3194E−03  −1.6808E−05 1.6760E−04 −4.4064E−05 R5 −2.2985E+01  7.8423E−04 −6.8524E−04   1.1392E−03 −4.1939E−04   1.0045E−04 R6 −2.9255E+00 −4.7049E−03 8.1474E−03 −4.5444E−03 4.3630E−03 −3.3853E−03 R7  5.9685E+00 −1.2716E−02 2.6632E−03 −1.9203E−03 1.0380E−03 −2.7052E−04 R8 −1.1340E+01 −1.4861E−02 5.1933E−03 −5.2052E−03 4.1375E−03 −2.1051E−03 R9 −1.5041E+00 −1.4122E−02 4.9795E−04  6.7798E−04 −3.9103E−04   1.0082E−04 R10 −7.2179E+01 −1.5278E−02 −5.9437E−04   8.0518E−04 −1.9676E−04  −2.9238E−05 R11 −8.9749E+01 −6.3963E−03 −9.8178E−03   4.0051E−03 −1.4257E−03   4.0979E−04 R12  6.5289E+00 −1.6980E−03 −9.6131E−03   3.7437E−03 −9.2822E−04   1.7014E−04 R13 −5.1081E+01 −6.9651E−02 9.1108E−03 −1.8231E−03 1.3384E−03 −5.2517E−04 R14 −1.0591E+01 −4.8742E−02 7.3860E−03  5.1117E−04 −6.6748E−04   1.6027E−04 R15  2.4383E+00 −3.1590E−02 3.1059E−02 −1.2128E−02 2.7152E−03 −4.2033E−04 R16  7.0305E+00 −2.9348E−02 2.4427E−02 −8.2765E−03 1.6094E−03 −2.0173E−04 Conic coefficient Aspheric surface coefficients k A14 A16 A18 A20 R1 −2.2040E−01 1.2302E−07 −6.6076E−09 1.6844E−10 −1.6601E−12  R2  9.0000E+01 7.7801E−07 −4.1277E−08 1.1634E−09 −1.3465E−11  R3  8.9990E+01 1.6622E−05 −7.5238E−07 0.0000E+00 0.0000E+00 R4 −7.7681E+01 2.6916E−06  4.0034E−07 −4.7290E−08  0.0000E+00 R5 −2.2985E+01 −1.8147E−05   1.6231E−06 0.0000E+00 0.0000E+00 R6 −2.9255E+00 1.7344E−03 −5.3789E−04 9.0871E−05 −6.3814E−06  R7  5.9685E+00 3.8456E−05 −2.4522E−06 0.0000E+00 0.0000E+00 R8 −1.1340E+01 7.0858E−04 −1.4835E−04 1.7370E−05 −8.6943E−07  R9 −1.5041E+00 −1.1395E−05   4.3392E−07 0.0000E+00 0.0000E+00 R10 −7.2179E+01 1.9161E−05 −2.8340E−06 1.3408E−07 0.0000E+00 R11 −8.9749E+01 −8.9646E−05   1.1260E−05 −5.5853E−07  0.0000E+00 R12  6.5289E+00 −2.7237E−05   3.5845E−06 −3.0296E−07  1.1601E−08 R13 −5.1081E+01 1.0612E−04 −1.1600E−05 6.2692E−07 −1.2406E−08  R14 −1.0591E+01 −1.9557E−05   1.3514E−06 −5.0291E−08  7.8280E−10 R15  2.4383E+00 4.6367E−05 −3.3544E−06 1.3823E−07 −2.4194E−09  R16  7.0305E+00 1.6807E−05 −9.0627E−07 2.8693E−08 −4.0328E−10 

Table 7 and table 8 show design data of inflexion points and arrest points of each lens of the camera optical lens 20 in Embodiment 2 of the present disclosure.

TABLE 7 Number(s) of Inflexion point Inflexion point inflexion points position 1 position 2 P1R1 0 / / P1R2 1 0.295 / P2R1 0 / / P2R2 0 / / P3R1 0 / / P3R2 0 / / P4R1 0 / / P4R2 2 0.815 1.505 P5R1 1 0.865 / P5R2 1 0.445 / P6R1 0 / / P6R2 1 2.535 / P7R1 1 0.405 / P7R2 2 0.635 2.795 P8R1 2 2.605 3.235 P8R2 2 1.215 1.625

TABLE 8 Number(s) of arrest points Arrest point position 1 P1R1 0 / P1R2 1 0.495 P2R1 0 / P2R2 0 / P3R1 0 / P3R2 0 / P4R1 0 / P4R2 0 / P5R1 1 1.615 P5R2 1 0.765 P6R1 0 / P6R2 0 / P7R1 1 0.715 P7R2 1 1.275 P8R1 0 / P8R2 0 /

FIG. 6 and FIG. 7 illustrate a longitudinal aberration and a lateral color of light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, 470 nm and 430 nm after passing the camera optical lens 20 in Embodiment 2, respectively. FIG. 8 illustrates a schematic diagram of a field curvature and a distortion of light with a wavelength of 555 nm after passing the camera optical lens 20 in Embodiment 2. A field curvature S in FIG. 8 is a field curvature in a sagittal direction, and T is a field curvature in a tangential direction.

As shown in the subsequent Table 13, the camera optical lens 20 in Embodiment 2 satisfies the various conditions.

In this embodiment, an entrance pupil diameter (ENPD) of the camera optical lens 20 is 4.153 mm, an image height (IH) of 1.0 H is 4.000 mm, and a field of view (FOV) in the diagonal direction is 46.40°. Thus, the camera optical lens 20 achieves ultra-thinness and long focal length, the on-axis and off-axis chromatic aberration is sufficiently corrected, thereby achieving excellent optical performance.

Embodiment 3

Embodiment 3, which provides a camera optical lens 30 structurally shown in FIG. 9 , is basically the same as Embodiment 1 and involves symbols having the same meanings as Embodiment 1, and only differences therebetween will be described in the following.

In this embodiment, the fourth lens L4 has a negative refractive power, the first lens L1 includes an image-side surface being concave in the paraxial region, the second lens L2 includes an object-side surface being convex in a paraxial region and an image-side surface being concave in the paraxial region

Table 9 and Table 10 show design data of a camera optical lens 30 in Embodiment 3 of the present disclosure.

TABLE 9 R d nd νd S1 ∞ d0= −0.600 R1 2.840 d1= 0.908 nd1 1.5444 ν1 55.82 R2 33.781 d2= 0.070 R3 26.091 d3= 0.273 nd2 1.6700 ν2 19.39 R4 276.995 d4= 0.047 R5 6.440 d5= 0.200 nd3 1.6700 ν3 19.39 R6 2.969 d6= 1.442 R7 9.462 d7= 0.250 nd4 1.6700 ν4 19.39 R8 9.284 d8= 0.608 R9 6.090 d9= 0.701 nd5 1.5346 ν5 55.70 R10 14.343 d10= 0.878 R11 −17.736 d11= 0.739 nd6 1.5844 ν6 28.22 R12 −8.464 d12= 0.501 R13 13.013 d13= 0.536 nd7 1.5346 ν7 55.70 R14 2.777 d14= 0.382 R15 −8.121 d15= 0.350 nd8 1.5346 ν8 55.70 R16 −8.999 d16= 0.620 R17 ∞ d17= 0.210 ndg 1.5168 νg 64.17 R18 ∞ d18= 0.238

Table 10 shows aspheric surface data of each lens of the camera optical lens 30 in Embodiment 3 of the present disclosure.

TABLE 10 Conic coefficient Aspheric surface coefficients k A4 A6 A8 A10 A12 R1 −1.9534E−01  1.0132E−03 3.8422E−05  1.8189E−05 −3.2809E−06 −1.0844E−07 R2  3.0355E+01  1.4688E−03 2.6020E−04 −2.4788E−04  7.8900E−05 −1.4476E−05 R3  9.0000E+01  5.0633E−03 −3.9569E−03   1.0286E−03 −6.0750E−04  2.5349E−04 R4 −9.0000E+01  3.0703E−03 −4.0189E−03   3.3610E−05  7.1650E−04 −3.0958E−04 R5 −4.6655E+01 −1.3358E−02 1.3007E−02 −6.7350E−03  3.4132E−03 −1.1045E−03 R6 −3.1396E+00 −1.7981E−02 2.6767E−02 −1.5318E−02  9.5149E−03 −5.2912E−03 R7  1.2816E+01 −1.1692E−02 2.1082E−03 −9.5063E−05 −7.6131E−05  8.2987E−05 R8  4.6593E+00 −1.7006E−02 3.2353E−03  2.0415E−04 −7.0241E−04  5.6002E−04 R9 −5.6426E+00 −1.4177E−02 6.4305E−04  5.3795E−04 −3.2476E−04  8.4407E−05 R10 −6.7386E+01 −1.4832E−02 −2.3721E−03   1.6526E−03 −7.1212E−04  1.7511E−04 R11  5.5642E+01 −7.6056E−03 −1.0217E−02   3.9200E−03 −1.3626E−03  3.7314E−04 R12  2.8158E+00 −1.6980E−03 −9.6131E−03   3.7437E−03 −9.2822E−04  1.7014E−04 R13 −9.0000E+01 −8.6758E−02 2.0619E−02 −8.7738E−03  4.8082E−03 −1.7156E−03 R14 −1.2052E+01 −5.2380E−02 1.1929E−02 −2.7136E−03  6.0502E−04 −1.6560E−04 R15  5.5099E+00 −4.9225E−02 5.0474E−02 −2.3684E−02  6.6356E−03 −1.2760E−03 R16  5.3747E+00 −3.7187E−02 3.6281E−02 −1.3867E−02  2.9898E−03 −4.0667E−04 Conic coefficient Aspheric surface coefficients k A14 A16 A18 A20 R1 −1.9534E−01 3.9489E−08 −2.4443E−09 6.2570E−11 −5.9140E−13  R2  3.0355E+01 1.5413E−06 −9.3362E−08 2.9805E−09 −3.8870E−11  R3  9.0000E+01 −5.0193E−05   3.7847E−06 0.0000E+00 0.0000E+00 R4 −9.0000E+01 6.3534E−05 −7.2574E−06 4.0791E−07 0.0000E+00 R5 −4.6655E+01 1.8669E−04 −1.2676E−05 0.0000E+00 0.0000E+00 R6 −3.1396E+00 2.3918E−03 −7.6424E−04 1.4584E−04 −1.2166E−05  R7  1.2816E+01 −1.3755E−05  −1.7105E−08 0.0000E+00 0.0000E+00 R8  4.6593E+00 −2.2503E−04   5.6779E−05 −8.2517E−06  4.9276E−07 R9 −5.6426E+00 −9.3552E−06   3.3376E−07 0.0000E+00 0.0000E+00 R10 −6.7386E+01 −2.8406E−05   2.8413E−06 −1.3580E−07  0.0000E+00 R11  5.5642E+01 −7.5468E−05   8.1021E−06 −2.6657E−07  0.0000E+00 R12  2.8158E+00 −2.7237E−05   3.5845E−06 −3.0296E−07  1.1601E−08 R13 −9.0000E+01 3.5949E−04 −4.3452E−05 2.7840E−06 −7.2988E−08  R14 −1.2052E+01 3.2022E−05 −3.3762E−06 1.7830E−07 −3.7159E−09  R15  5.5099E+00 1.6616E−04 −1.3556E−05 6.1447E−07 −1.1710E−08  R16  5.3747E+00 3.5762E−05 −1.9752E−06 6.2261E−08 −8.5148E−10 

Table 11 and Table 12 show design data of inflexion points and arrest points of each lens in the camera optical lens 30 in Embodiment 3 of the present disclosure.

TABLE 11 Number(s) of Inflexion point Inflexion point inflexion points position 1 position 2 P1R1 0 / / P1R2 0 / / P2R1 1 1.085 / P2R2 1 0.645 / P3R1 0 / / P3R2 0 / / P4R1 1 1.975 / P4R2 1 2.035 / P5R1 1 0.995 / P5R2 1 0.565 / P6R1 0 / / P6R2 0 / / P7R1 1 0.275 / P7R2 2 0.615 2.595 P8R1 2 2.555 3.055 P8R2 2 1.095 1.575

TABLE 12 Number(s) of arrest points Arrest point position 1 P1R1 0 / P1R2 0 / P2R1 1 1.605 P2R2 1 0.895 P3R1 0 / P3R2 0 / P4R1 0 / P4R2 0 / P5R1 1 2.025 P5R2 1 0.965 P6R1 0 / P6R2 0 / P7R1 1 0.475 P7R2 1 1.215 P8R1 0 / P8R2 0 /

FIG. 10 and FIG. 11 illustrate a longitudinal aberration and a lateral color of light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, 470 nm and 430 nm after passing the camera optical lens 30 in Embodiment 3, respectively. FIG. 12 illustrates a schematic diagram of a field curvature and a distortion of light with a wavelength of 555 nm after passing the camera optical lens 30 in Embodiment 3. A field curvature S in FIG. 12 is a field curvature in a sagittal direction, and T is a field curvature in a tangential direction.

As shown in the subsequent Table 13, the camera optical lens 30 in Embodiment 3 satisfies the various conditions.

In this embodiment, an entrance pupil diameter (ENPD) of the camera optical lens 30 is 3.887 mm, an image height (IH) of 1.0H is 4.000 mm, and a field of view (FOV) in the diagonal direction is 49.26°. Thus, the camera optical lens 30 achieves long focal length and ultra-thinness, the on-axis and off-axis chromatic aberration is sufficiently corrected, thereby achieving excellent optical performance.

TABLE 13 Parameters and Embodi- Embodi- Embodi- conditions ment 1 ment 2 ment 3 f/TTL 0.96 0.96 0.96 f2/f 4.75 2.80 4.98 (R15 + R16)/(R15 − R16) −3.55 −4.11 −19.50 f 9.178 9.137 8.550 f1 5.964 5.891 5.618 f2 43.591 25.544 42.577 f3 −7.861 −6.880 −8.340 f4 76.518 77.207 −1677.501 f5 23.744 24.735 19.163 f6 38.865 26.917 26.738 f7 −10.666 −9.011 −6.705 f8 −29.706 −30.922 −180.295 f12 5.371 4.962 5.035 FNO 2.20 2.20 2.20 TTL 9.608 9.566 8.953 IH 4.000 4.000 4.000 FOV 45.52° 46.40° 49.26°

It will be understood by those of ordinary skill in the art that the embodiments described above are specific embodiments realizing the present disclosure, and that in practical applications, various changes may be made thereto in form and in detail without departing from the range and scope of the disclosure. 

What is claimed is:
 1. A camera optical lens comprising eight lenses which are, from an object side to an image side in sequence: a first lens having a positive refractive power, a second having a positive refractive power, a third lens having a negative refractive power, a fourth lens having a refractive power, a fifth lens having a positive refractive power, a sixth lens having a positive refractive power, a seventh lens having a negative refractive power, and an eighth lens having a negative refractive power; wherein the camera optical lens satisfies conditions of: 0.95≤f/TTL; 2.50≤f2/f≤5.00; and −20.00≤(R15+R16)/(R15−R16)≤−3.50; where TTL denotes a total optical length from an object-side surface of the first lens to an image surface of the camera optical lens along an optical axis; f denotes a focal length of the camera optical lens; f2 denotes a focal length of the second lens; R15 denotes a central curvature radius of an object-side surface of the eighth lens; and R16 denotes a central curvature radius of an image-side surface of the eighth lens.
 2. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies a condition of: 2.00≤R11/R12≤5.50; where R11 denotes a central curvature radius of an object-side surface of the sixth lens; and R12 denotes a central curvature radius of an image-side surface of the sixth lens.
 3. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies conditions of: 0.32≤f1/f≤0.99; −2.37≤(R1+R2)/(R1−R2)≤−0.65; and 0.05≤d1/TTL≤0.15; where f1 denotes a focal length of the first lens; R1 denotes a central curvature radius of the object-side surface of the first lens; R2 denotes a central curvature radius of an image-side surface of the first lens; and d1 denotes an on-axis thickness of the first lens.
 4. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies conditions of: −2.42≤(R3+R4)/(R3−R4)≤5.71; and 0.01≤d3/TTL≤0.05; where R3 denotes a central curvature radius of an object-side surface of the second lens; R4 denotes a central curvature radius of an image-side surface of the second lens; and d3 denotes an on-axis thickness of the second lens.
 5. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies conditions of: −1.95≤f3/f≤−0.50; 0.88≤(R5+R6)/(R5−R6)≤4.07; and 0.01≤d5/TTL≤0.07; where f3 denotes a focal length of the third lens; R5 denotes a central curvature radius of an object-side surface of the third lens; R6 denotes a central curvature radius of an image-side surface of the third lens; and d5 denotes an on-axis thickness of the third lens.
 6. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies conditions of: −392.40≤f4/f≤12.67; −27.17≤(R7+R8)/(R7−R8)≤157.97; and 0.01≤d7/TTL≤0.05; where f4 denotes a focal length of the fourth lens; R7 denotes a central curvature radius of an object-side surface of the fourth lens; R8 denotes a central curvature radius of an image-side surface of the fourth lens; and d7 denotes an on-axis thickness of the fourth lens.
 7. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies following conditions: 1.12≤f5/f≤4.06; −4.95≤(R9+R10)/(R9−R10)≤−1.26; and 0.03≤d9/TTL≤0.12; where f5 denotes a focal length of the fifth lens; R9 denotes a curvature radius of an object-side surface of the fifth lens; R10 denotes a curvature radius of an image-side surface of the fifth lens; and d9 denotes an on-axis thickness of the fifth lens.
 8. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies a condition of: 1.47≤f6/f≤6.35; 0.75≤(R11+R12)/(R11−R12)≤4.24; and 0.03≤d11/TTL≤0.12; where f6 denotes a focal length of the sixth lens; R11 denotes a central curvature radius of an object-side surface of the sixth lens; R12 denotes a central curvature radius of an image-side surface of the sixth lens; and d11 denotes an on-axis thickness of the sixth lens.
 9. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies a condition of: −2.32≤f7/f≤−0.52; 0.77≤(R13+R14)/(R13−R14)≤5.34; and 0.02≤d13/TTL≤0.09; where f7 denotes a focal length of the seventh lens; R13 denotes a central curvature radius of an object-side surface of the seventh lens; R14 denotes a central curvature radius of an image-side surface of the seventh lens; and d13 denotes an on-axis thickness of the seventh lens.
 10. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies a condition of: −42.17≤f8/f≤−2.16; and 0.02≤d15/TTL≤0.06; where f8 denotes a focal length of the eighth lens; and d15 denotes an on-axis thickness of the eighth lens. 